scienceHow many grams of CaO must be added to 50.0 mL of water to make the temperature increase from 25.0 ¡ÆC to 48.81 ¡ÆC? The reaction is CaO(s) + H2O(l) ¡ê Ca(OH)2(aq) -- ¥ÄH = -83.7 kJ Assume the heat capacity of the solution is the ...
Saturday, October 25, 2014 at 9:04pm

scienceDue to friction with the Earth's atmosphere, a large static electric charge could build up on our plummeting asteroid fragment. Would you expect our fragment to generate a magnetic field? Explain why or why not
Friday, October 24, 2014 at 7:00pm

Physical ScienceConsider lead, in what state will it be at each of the following temperatures? a) 4000 degrees Celsius, b) 40 degrees Celsius, c) 400 degrees Celsius, d) 327 degrees Celsius.
Friday, October 24, 2014 at 4:05pm

sciencea horticultural wants a plant that produces flowers with a certain size color and fragrance but it now aware of any one plant having all of these traits. the quickest way she could achieve her goal would be to apply the process of_____________
Friday, October 24, 2014 at 12:42pm

sciencea ladder is at rest with its upper end against a wall and the lower end on the ground .Is the ladder more likely to slip,when a man stands on it at the bottom or at the top?gove reason.
Thursday, October 23, 2014 at 11:37pm

mathA) If x^2+y^3−xy^2=19, find dy/dx in terms of x and y. dy/dx=________ B) Using your answer for dy/dx, fill in the following table of approximate y-values of points on the curve near x=1 y=3. 0.96 ______ 0.98 ______ 1.02 ______ 1.04 ______ C) Finally, find the y-value for...
Thursday, October 23, 2014 at 10:04pm

ScienceA straight line with a positive slope on a velocity-time graph indicates which of the following? no movement constant acceleration toward the reference constant velocity away from the reference constant acceleration away from the reference
Thursday, October 23, 2014 at 9:25pm

SCIENCE FOR 7TH GRADE i need to conduct a scientific investigation and i need some ideas. Ex. " how does the amount of sunlight affect a plants growth" I need something like what is listed above. Thank you
Thursday, October 23, 2014 at 6:07pm

science!!A couple has just learned that their daughter has hemophilia. They already have a son who does not have the disease. What are the genotypes of the couple? Explain your reasoning. ---------------- The gene for hemophilia is sex-linked, a recessive on the X-chromosome. The ...
Thursday, October 23, 2014 at 3:55pm

ScienceA cell starts with 12 chromosomes, then goes through mitosis. How many cells are produced at the end of mitosis? How many chromosomes are in each of the cells at the end of mitoses? A cell starts with 12 chromosomes, then goes through meiosis. How many cells are produced at ...
Thursday, October 23, 2014 at 3:00pm

scienceRalph has the same mass of 72.6 kg, and his maximum velocity is still 7.3 m/s on the swing. What is the maximum height that Ralph reaches on his swing?
Thursday, October 23, 2014 at 1:59pm

scienceRalph is also swinging at the park. He has a mass of 72.6 kg, and his maximum velocity at the lowest point in his swing is 7.3 m/s. What is Ralphs maximum kinetic energy?
Thursday, October 23, 2014 at 1:54pm

scienceRalph is also swinging at the park. He has a mass of 72.6 kg, and his maximum velocity at the lowest point in his swing is 7.3 m/s. What is Ralphs maximum kinetic energy?
Thursday, October 23, 2014 at 1:53pm

Int.scienceThe size of the chosen symbols on a graph may be used to indicate the: location of the data coordinates of the data uncertainty of the data relationship of the variables
Thursday, October 23, 2014 at 12:09pm

Int.scienceThe size of the chosen symbols on a graph may be used to indicate the: location of the data coordinates of the data uncertainty of the data relationship of the variables
Thursday, October 23, 2014 at 10:51am

sciencesuppose some natural disaster occurs and a species of finch is forced to relocate from its original island where us dined on cactus flowers ti ab adjacent island with many fewer cacti but an overabundance of orchids. what would be the immediate consequences to the species in ...
Wednesday, October 22, 2014 at 9:54pm

scienceTwo toy ducks attached to each other by a string, are being pulled by a child. The front duck is m1= 5.0 kg and the back duck is m2= 2.0 kg. The happy guy pulls them with a force of 10 N and friction exists. The toys are moving with constant velocity. A) if the coefficient of ...
Wednesday, October 22, 2014 at 8:29pm

SciencePleasant Beach is two meters above sea level at its highest point. If the ocean waves along the shore increase to a height of five meters, then the elevation of Pleasant Beach will most likely A.decrease to nearly zero meters B.increase to more than two meters C.decrease ...
Wednesday, October 22, 2014 at 8:07pm

ScienceContour lines that are close together always indicate steeper slopes than contour lines which are spaced farther apart Do you agree or disagree explain? I agree but I don't know how to explain
Wednesday, October 22, 2014 at 8:06pm

scienceA 25mL solution of nitric acid was placed in a flask and a few drops of phenolphthalein were added. Dilute sodium hydroxide was added until the indicator changed colour. It was found that 28mL of the alkali was used. What colour was the solution in the flask at the start of ...
Wednesday, October 22, 2014 at 7:34pm

science1. radioactive decay occurs when atoms A- lose mass * B- join with atoms of another element C- break down to form atoms of another element D- are exposed to chemical weathering 2. if you want to consult the geologic time scale for when the first vertebrates evolved, where ...
Wednesday, October 22, 2014 at 6:03pm

Science DensityWater has a density of 1.0g/cm3. Aperson sits in a bath 150cm in length and 90 cm width. Thw water had a depth of 60cm befor the person sat in the bath. after sitting in the bath the water level rose to 68cm. Calculate the mass of the person, giving your answer in kg.
Wednesday, October 22, 2014 at 4:47pm

ScienceCarbon monoxide, CO, and hydrogen, H2, react according to the reaction below. 4 CO(g)+ 9 H2(g)--> C4H10(g)+ 4 H2O(g) What volume of the excess reactant remains if 19.6 L CO and 27.2 L H2 are allowed to react. Assume that the volumes of both gases are measured at 713oC and 1...
Wednesday, October 22, 2014 at 4:34pm

scienceSome constellations such as Ursa Minor, are visible in the sky year round other constellations appear for only part of the year.Explain why this happens.
Wednesday, October 22, 2014 at 4:07pm

science 1. The process in which the chromosomes in sex cells are reproduced by half is called _____________. 2. A white mouse is crossed with a black mouse. all of the offspring were grey. The genes for fur color in mice show _________. 3. Genes are specific sections of __________. 13...
Wednesday, October 22, 2014 at 3:23pm

science1. radioactive decay occurs when atoms A- lose mass * B- join with atoms of another element C- break down to form atoms of another element D- are exposed to chemical weathering 2. if you want to consult the geologic time scale for when the first vertebrates evolved, where ...
Wednesday, October 22, 2014 at 2:34pm

FinanceThe requirement for computer server capacity at Acme Industries is expected to increase at a rate of 15% per year for the next 5 years. If the server capacity is expected to be 1,400 gigabytes in 5 years, how many gigabytes of capacity are there today? Round to the nearest ...
Wednesday, October 22, 2014 at 12:47pm

Science- AstronomySuppose we find a planet in another solar system that has an earth like atmosphere with plentiful oxygen but no life of any kind. Question= Is this discovery considered reasonable or surprising can you please explain? Thank you
Wednesday, October 22, 2014 at 10:30am

Science: TeethI'm doing a science project on how various acids affect tooth enamel. I'm planning to put the teeths in separate containers and fill 5 containers with coca cola, and 5 others with a citric acid drink. I'm also planning for two weeks to examine the teeths. What can ...
Wednesday, October 22, 2014 at 2:50am

Need help pleas (science) . Why are energy transformation important for an ecosystem's stability? . What is the role of photosynthesis I'm making energy "usable" for life? . What is the link between decomposition and photosynthesis? . What is the connection of energy flow through ...
Tuesday, October 21, 2014 at 11:19pm

physical sciencecalculate the force output by the larger piston of a hydraulic lift when a force of 700 newtons is excerted on the smaller piston and the areas of the two pistons are 20cm and 950cm squared.
Tuesday, October 21, 2014 at 10:34pm

Science!Ernest Rutherford's atomic model included a nucleus comprised of positive particles called protons. Later, James Chadwick discovered neutrons. How did Chadwick's discovery change the atomic model? A. The new model showed a negatively charged nucleus. B. The new model ...
Tuesday, October 21, 2014 at 9:59pm

scienceWhat is true about the element francium(Fr,atomic number 87)? Choose all that apply. a. it has 7 valence electrons b. it is likely to form ionic bonds c. it is a nonmetal d. it is in period 7 e. it is a metal Is the answer a,d,e?
Tuesday, October 21, 2014 at 9:51pm

Science. Why are energy transformation important for an ecosystem's stability? . What is the role of photosynthesis I'm making energy "usable" for life? . What is the link between decomposition and photosynthesis? . What is the connection of energy flow through ...
Tuesday, October 21, 2014 at 7:35pm

Science. Why are energy transformation important for an ecosystem's stability? . What is the role of photosynthesis I'm making energy "usable" for life? . What is the link between decomposition and photosynthesis? . What is the connection of energy flow through ...
Tuesday, October 21, 2014 at 5:03pm

Science!Which is most likely to be part of an ionic bond? A. An atom with no valence electrons B. An atom with one valence electron C. An atom with two valence electrons D. An atom with three valence electrons Is the answer B?
Tuesday, October 21, 2014 at 4:39pm

scienceWhich of the following statements is true? A. An object that is accelerating is always changing direction. B. An object that is accelerating is always changing speed. C. An object at rest has an instantaneous acceleration of zero. D. Instantaneous acceleration is always ...
Tuesday, October 21, 2014 at 2:18pm

ScienceScience project ideas for science fair. I need to prepare a model for science fair. But I need some ideas about the major problems facing today's world. So that I can get idea for improvement in any area and to show this in science fair. Please get me know about the ...
Tuesday, October 21, 2014 at 4:20am

Science1. How might sexual reproduction decrease an organisms chance of survival? A)If the offspring inherits a genetic combination that includes a harmful trait, it could decrease the organisms chance of survival. ***** B)If the offspring inherits the exact same genetic ...
Tuesday, October 21, 2014 at 3:54am

science 1) a pea plant with yellow seeds is crossed with a pea plant with green seeds. all of the offsprings have yellow seeds. the allele for yellow sees is a. Dominate because all offspring have yellow seeds. b. Recessive because all of the offsprings have yellow seeds. c. dominant ...
Tuesday, October 21, 2014 at 12:19am

Science HelpIts the night of the BIG homecoming dance and you just cant wait. You think you have everything planned perfectly! On your way to the dance though there is some slow driving JERK in front of you so you slam on the gas going from 30. mi/hr to 60. mi/hr. Luckily your...
Monday, October 20, 2014 at 10:19pm

Science1.) Robin hood shoots an arrow up in the night sky. What is the acceleration at the very top of its path? 2.) Juan's car has an acceleration = -2.76m/s^2 and a velocity = 43m/s. Is he slowing down or speeding up?
Monday, October 20, 2014 at 9:03pm

science-chemistryAn aqueous solution of ammonium nitrite decomposes when heated to give off nitogen gas and water. This reaction can be used to prepare pure nitrogen gas. How many grams of ammonium nitrite must have reacted if 3.75 liters of nitrogen gas was colleced over water at 25˚C ...
Monday, October 20, 2014 at 5:38pm

Physical ScienceA long distance swimmer, who is very cold, m=100 kg., 1000 kilocalories are supplied to warm them up. The specific heat for a human is 0.83. A) What will be the temperature change? B) If the original temperature is 85 degrees, find the final temperature.
Monday, October 20, 2014 at 5:01pm

Physical ScienceThe sand on the beach heats up faster each day than the water does. You know this because when you walk on the beach in the early morning, your feet are cool. By noon, the beach is so hot, you cannot walk on it in bare feet . The ocean, however stays cool. Which one has the ...
Monday, October 20, 2014 at 4:48pm

science1. radioactive decay occurs when atoms A- lose mass B- join with atoms of another element C- break down to form atoms of another element D- are exposed to chemical weathering 2. if you want to consult the geologic time scale for when the first vertebrates evolved, where would ...
Monday, October 20, 2014 at 9:59am

scienceYou are running from a zombie with a velocity of 2.5 m / s. If you run for 1500 meters and have a mass of 61.4 kg, how much work have you done?
Sunday, October 19, 2014 at 9:51pm

Math/ScienceThree bullets are fired simultaneously by three guns aimed toward the center of a circle where the bullets mash into a stationary lump. The angle between the guns is 120°. Two of the bullets have a mass of 9.30 10-3 kg and are fired with a speed of 440 m/s. The third ...
Sunday, October 19, 2014 at 8:40pm

Physics In a science fiction novel two enemies, Bonzo and Ender, are fighting in outer spce. From stationary positions, they push against each other. Bonzo flies off with a velocity of +2.2 m/s, while Ender recoils with a velocity of -2.9 m/s. Determine the ratio mBonzo/mEnder of the ...
Sunday, October 19, 2014 at 5:18pm

science1. radioactive decay occurs when atoms A- lose mass B- join with atoms of another element C- break down to form atoms of another element D- are exposed to chemical weathering 2. if you want to consult the geologic time scale for when the first vertebrates evolved, where would ...
Sunday, October 19, 2014 at 1:23pm

scienceWhat is the visual reaction when CuSO4 and NaCO3 is combined? I know what to do, I just forgot the info at school and I need this done by tomorrow. I would prefer to figure it out on my own but I don't have the chemicals at my house and I can't find anything online to ...
Sunday, October 19, 2014 at 11:22am

scienceI did the work for this lab but forgot to record the data. It was a double displacement of CuSO4 and NaCO3. If someone could help me with the visual reaction that would help me out a lot. I know what to do I just don't remember what happens.
Sunday, October 19, 2014 at 11:12am

Science Help1.) A rail gun uses electromagnetic energy to accelerate objects quickly over a short distance. In an experiment, a 2.00 kg projectile remains on the rails of the gun for only 2.10x10-2 s, but in that time it goes from rest to a velocity of 4.00×103 m/s. What is the ...
Saturday, October 18, 2014 at 5:29pm

biology Part A. Making Visual Connections with the Textbook (5 points) You can answer these in a Word document, indicating the question number followed by your answer. Below is the Absorption Spectrum of Photosynthesis. As your textbook explains, plants have a number of light-...
Friday, October 17, 2014 at 11:11pm

Materials ScienceA hollow cylinder with outer radius r0 and inner radius ri is loaded by a uniformly distributed load q across its length L. The beam is supported by a roller at its left end and a pin L5 from its right end. What is the maximum bending moment in the beam? Express your answer in...
Friday, October 17, 2014 at 10:36pm

Materials ScienceA 4-point bending test is performed on the same beam, with symmetric loads of 5kN separated by 2m. Draw the bending moment and shear force diagrams for the beam. Then answer the following questions about the shear force V and bending moment M. What is the shear force in the ...
Friday, October 17, 2014 at 10:32pm

Materials ScienceA 3-point bending test is performed on a simply supported beam of length L=4m and of rectangular cross-section, with width b and height h. For a central load of 10kN, draw the bending moment and shear force diagrams for the beam. Then answer the following questions about the ...
Friday, October 17, 2014 at 10:30pm